internal HandState(Hand source)
{
Cards = BitwiseCardHelper.CardCollectionToBits(source.Cards);
if (source.PlayedCard.HasValue)
{
Move = new Move(BitwiseCardHelper.CardToBits(source.PlayedCard.Value));
}
Tricks = source.Tricks;
}
internal PlayingState(PlayingContext context)
{
mContext = context;
Game game = context.Game;
for (int i = 0; i < HandCount; i++)
{
mHands[i] = new HandState(game.GetHand(i));
}
mActiveIndex = game.ActiveHand.Index;
mDiscards = BitwiseCardHelper.CardCollectionToBits(game.PlayingContext.Discards);
mLeadingSuit = context.InitialSuit;
}
/// <summary>
/// Calculates a mathematical expectation of the active hand for a certain game type.
/// Uses the expecti-max algorithm to compute the value among all possible widow cards and further discards.
/// Updates the <see cref="Expectation"/> property.
/// </summary>
/// <returns></returns>
internal void Evaluate()
{
int ownCards = BitwiseCardHelper.CardCollectionToBits(mGame.ActiveHand.Cards);
int unknownCards = ~ownCards;
Debug.Assert(BitwiseCardHelper.GetCardCount(unknownCards) == 22);
var values = new List <double>();
var enumerator = new TwoCardsEnumerator(unknownCards);
while (enumerator.MoveNext())
{
int ownCardsWithWidow = ownCards | enumerator.Current;
double value = EvaluateDiscards(ownCardsWithWidow);
values.Add(value);
}
Expectation = values.Average();
}